And for good measure: reverting that commit 20bf2b378729c4a0366a53e2018a0b70ace94bcd
flagged by the bisect right on top of the current tree compiles fine. On Sun, Feb 07, 2021 at 07:26:01PM -0500, Stuart Little wrote: > The result of the bisect on the issue reported in the previous message: > > --- cut --- > > 20bf2b378729c4a0366a53e2018a0b70ace94bcd is the first bad commit > commit 20bf2b378729c4a0366a53e2018a0b70ace94bcd > Author: Josh Poimboeuf <[email protected]> > Date: Thu Jan 28 15:52:19 2021 -0600 > > x86/build: Disable CET instrumentation in the kernel > > With retpolines disabled, some configurations of GCC, and specifically > the GCC versions 9 and 10 in Ubuntu will add Intel CET instrumentation > to the kernel by default. That breaks certain tracing scenarios by > adding a superfluous ENDBR64 instruction before the fentry call, for > functions which can be called indirectly. > > CET instrumentation isn't currently necessary in the kernel, as CET is > only supported in user space. Disable it unconditionally and move it > into the x86's Makefile as CET/CFI... enablement should be a per-arch > decision anyway. > > [ bp: Massage and extend commit message. ] > > Fixes: 29be86d7f9cb ("kbuild: add -fcf-protection=none when using > retpoline flags") > Reported-by: Nikolay Borisov <[email protected]> > Signed-off-by: Josh Poimboeuf <[email protected]> > Signed-off-by: Borislav Petkov <[email protected]> > Reviewed-by: Nikolay Borisov <[email protected]> > Tested-by: Nikolay Borisov <[email protected]> > Cc: <[email protected]> > Cc: Seth Forshee <[email protected]> > Cc: Masahiro Yamada <[email protected]> > Link: https://lkml.kernel.org/r/20210128215219.6kct3h2eiustncws@treble > > Makefile | 6 ------ > arch/x86/Makefile | 3 +++ > 2 files changed, 3 insertions(+), 6 deletions(-) > > --- end --- > > On Sun, Feb 07, 2021 at 06:31:22PM -0500, Stuart Little wrote: > > I am trying to compile on an x86_64 host for a 32-bit system; my config is > > at > > > > https://termbin.com/v8jl > > > > I am getting numerous errors of the form > > > > ./include/linux/kasan-checks.h:17:1: error: ‘-mindirect-branch’ and > > ‘-fcf-protection’ are not compatible > > > > and > > > > ./include/linux/kcsan-checks.h:143:6: error: ‘-mindirect-branch’ and > > ‘-fcf-protection’ are not compatible > > > > and > > > > ./arch/x86/include/asm/arch_hweight.h:16:1: error: ‘-mindirect-branch’ and > > ‘-fcf-protection’ are not compatible > > > > (those include files indicated whom I should add to this list; apologies if > > this reaches you in error). > > > > The full log of the build is at > > > > https://termbin.com/wbgs > > > > --- > > > > 5.11.0-rc6 built fine last week on this same setup.
